docs: 添加管理平台标准加密算法 Kotlin 参考实现

docs/工具箱端-授权对接指南/utils/JwtUtil.kt

@@ -0,0 +1,50 @@
+package top.tangyh.lamp.filing.utils
+
+import io.jsonwebtoken.Jwts
+import io.jsonwebtoken.SignatureAlgorithm
+import io.jsonwebtoken.security.Keys
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.stereotype.Component
+import java.time.LocalDateTime
+import java.time.ZoneId
+import java.util.*
+import javax.crypto.SecretKey
+
+@Component
+class JwtUtil(
+    @Value("\${jwt.secret}")
+    private val secretKey: String
+) {
+
+
+    // 生成签名 Key（HS256）
+    private val signingKey: SecretKey = Keys.hmacShaKeyFor(Base64.getDecoder().decode(secretKey))
+
+    /**
+     * 生成 Token
+     * */
+    fun generateToken(subject: String, claims: Map<String, Any> = emptyMap(), expireDays: Long = 7): String {
+        val now = LocalDateTime.now()
+        val expiration = now.plusDays(expireDays)
+
+        return Jwts.builder()
+            .setSubject(subject)
+            .setClaims(claims)
+            .setIssuedAt(Date.from(now.atZone(ZoneId.systemDefault()).toInstant()))
+            .setExpiration(Date.from(expiration.atZone(ZoneId.systemDefault()).toInstant()))
+            .signWith(signingKey, SignatureAlgorithm.HS256)
+            .compact()
+    }
+
+
+    /**
+     * 解析 Token 获取 Claims
+     */
+    fun parseToken(token: String): Map<String, Any> {
+        return Jwts.parserBuilder()
+            .setSigningKey(signingKey)
+            .build()
+            .parseClaimsJws(token)
+            .body
+    }
+}